The Flame Retardant Fiberglass Bag is designed for use when charging, storing or transporting lithium polymer batteries. The higher power of Lipo batteries is obtained by strong chemicals, which make the batteries highly flammable. If these batteries are punctured or damaged, a fire may occur. This bag significantly reduces the consequences of these types of accidents. With the dimensions of 18cm x 23cm, almost all lipo batteries fit in it. A must have for anyone who uses lipo batteries for his or her hobby.